Binary and hexadecimal number systems, data units, and how text, sound and images are represented as binary.
Why computers use binary
Computers are built from electronic switches (transistors) that have only two states: on (1) and off (0). Because of this, all data inside a computer is stored and processed in binary — the base-2 number system, using only the digits 0 and 1. A single binary digit is called a bit.
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